Mark Chwajol, M.D.
NPI 1356575690ActiveIndividual· Neurological Surgery· Chicago, IL
Neurological Surgery (M.D.) with Osf Multi-Specialty Group and 1 other group, practicing in Chicago, Illinois. Mostly services rather than prescriptions: Medicare paid $50,911 for 88 patients in 2024, with only 23 Part D claims. Baxter Healthcare was the largest of 3 companies reporting payments in 2025, $1,778 in all, mostly consulting fees. Lists Mercy Health System Corp and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1356575690 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 13, 2009 |
| Last updated in NPPES | Jun 30, 2026 |
| Certified by provider | Jun 30, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Neurological Surgery Primary | 207T00000X | 036.123878 | IL |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Neurosurgery (IL); Practitioner - Neurosurgery (WI) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 88 |
|---|---|
| Services billed | 173 across 40 procedure codes |
| Paid by Medicare | $50,911 |
Part D prescriptions in 2024
| Prescriptions (claims) | 23 · 26 30-day fills |
|---|---|
| Total drug cost | $143.56 |
| Generic share | 100% of claims |
Education and affiliations
| Graduation year | 2002 |
|---|---|
| Medicare specialty | Neurosurgery |
| Telehealth | Offers telehealth |
Medical groups
- Osf Multi-Specialty GroupMorton, IL · 2,114 clinicians
- Mercy Health System CorporationJanesville, WI · 753 clinicians
Hospital affiliations
- Mercy Health System CorpJanesville, WI
- Osf Saint Elizabeth Mdl CtrPeru, IL
- Saint Anthony Medical CenterRockford, IL
Industry payments (Open Payments)
- 2025$1,778 · 3 payments from 3 companies
- 2024$685.40 · 8 payments from 5 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Baxter Healthcare | $1,668 | 1 |
| Stryker Corporation | $66.06 | 1 |
| Augmedics Inc. | $43.94 | 1 |
What the 2025 payments were for
- Consulting Fee$1,668 · 1 payment
- Food and Beverage$110.00 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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